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Determination of radioactive strontium in seawater [An article from: Analytica Chimica Acta]
Book Details
Author(s)Z. Grahek, M. Rozmaric Macefat
PublisherElsevier
ISBN / ASINB000RR3HRO
ISBN-13978B000RR3HR3
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
This paper describes the procedures of isolating strontium and yttrium from seawater that enable the determination of ^8^9^,^9^0Sr. In one procedure, strontium is directly isolated from seawater on the column filled with Sr resin by binding of strontium to the resin from 3M HNO"3 in a seawater, and successive elution with HNO"3. In others, strontium is precipitated from seawater with (NH"4)"2CO"3, followed by isolation on a Sr column or an anion exchange column. It is shown that strontium precipitation is optimal with concentration of 0.3M (NH"4)"2CO"3 at pH=11. In these conditions, 100% Y, 78% Sr, 80% Ca and 50% Mg are precipitated. Strontium is bound on to Sr column from 5 to 8M HNO"3, separated from other elements by elution with 3M HNO"3 and 0.05M HNO"3. Strontium and yttrium are bound on to anion exchange column from alcoholic solutions of nitric acid. The optimum mixture of alcohols for sample binding is a mixture of ethanol and methanol with the volume ratio 1:3. Strontium and yttrium are separated from Mg, Ca, K, and other elements by elution with 0.25M HNO"3 in the mixture of ethanol and methanol. After the separation, yttrium and strontium are eluted from the column with water or methanol. In the procedure of direct isolation from 1l of the sample, the average recovery of 50% was obtained. In the remaining two procedures, the strontium recovery was about 60% for the Sr column and 65% for anion exchange column. Recovery of yttrium is about 70% for the anion exchange column. It turned out that the procedure with the Sr resin (direct isolation and isolation after precipitation) is simpler and faster in the phase of the isolation on the column in comparison with the procedure with the anion exchanger. The procedure with the anion exchanger, however, enables the simultaneous isolation of yttrium and strontium and rapid determination of ^8^9^,^9^0Sr. These procedures were tested by determination of ^8^9^,^9^0Sr on liquid scintillation counter and Cherenkov counting in 5M HNO"3. Obtained results showed that activity of 50mBql^-^1 of ^8^9^,^9^0Sr and higher can be simultaneously determined.
Description:
This paper describes the procedures of isolating strontium and yttrium from seawater that enable the determination of ^8^9^,^9^0Sr. In one procedure, strontium is directly isolated from seawater on the column filled with Sr resin by binding of strontium to the resin from 3M HNO"3 in a seawater, and successive elution with HNO"3. In others, strontium is precipitated from seawater with (NH"4)"2CO"3, followed by isolation on a Sr column or an anion exchange column. It is shown that strontium precipitation is optimal with concentration of 0.3M (NH"4)"2CO"3 at pH=11. In these conditions, 100% Y, 78% Sr, 80% Ca and 50% Mg are precipitated. Strontium is bound on to Sr column from 5 to 8M HNO"3, separated from other elements by elution with 3M HNO"3 and 0.05M HNO"3. Strontium and yttrium are bound on to anion exchange column from alcoholic solutions of nitric acid. The optimum mixture of alcohols for sample binding is a mixture of ethanol and methanol with the volume ratio 1:3. Strontium and yttrium are separated from Mg, Ca, K, and other elements by elution with 0.25M HNO"3 in the mixture of ethanol and methanol. After the separation, yttrium and strontium are eluted from the column with water or methanol. In the procedure of direct isolation from 1l of the sample, the average recovery of 50% was obtained. In the remaining two procedures, the strontium recovery was about 60% for the Sr column and 65% for anion exchange column. Recovery of yttrium is about 70% for the anion exchange column. It turned out that the procedure with the Sr resin (direct isolation and isolation after precipitation) is simpler and faster in the phase of the isolation on the column in comparison with the procedure with the anion exchanger. The procedure with the anion exchanger, however, enables the simultaneous isolation of yttrium and strontium and rapid determination of ^8^9^,^9^0Sr. These procedures were tested by determination of ^8^9^,^9^0Sr on liquid scintillation counter and Cherenkov counting in 5M HNO"3. Obtained results showed that activity of 50mBql^-^1 of ^8^9^,^9^0Sr and higher can be simultaneously determined.
